Question

25. A body moves along x-axis with its position as a
function of time t given as x = 3 - 4t. Considering
all Sl units, the acceleration of the particle at
t=2s is
(1) 2 m/s2
(3) 6 m/s2
(2) 4 m/s2
(4) 8 m/s2​

Answer 1

Answer:

answer is 8/se is a right answer

Answer 2

Answer:

If x = 3 - 4t

Then, v = dx/dt = -4

Hence, a = dv/dt = 0

I think your question would be

x = 3 - 4t²

Then, v = -8t

Hence, a = -8m/s²

retardation = 8m/s² for 2s

Hence option 4 would be correct

If your question and options written above is correctly written from your book then you can report this answer